The state owns a woman's body, but only for child birth. She/they is back on their own once they have the birth.
And if Republicans had their way, the mother and child would never get assistance of any kind from the state, ever. No pre-natal, no paid leave, no maternity leave, no breastfeeding rooms, no food assistance/SCHIP, no pre-K, no education, no child care, no child tax credits.
What actual science/obstetrics/research goes into picking six weeks? Clearly none.